http://europepmc.org/abstract/MED/22634756
http://europepmc.org/abstract/MED/28481359
http://europepmc.org/abstract/MED/25159915
http://europepmc.org/abstract/MED/25021421
http://europepmc.org/abstract/MED/26850916
http://europepmc.org/abstract/MED/23788652
http://europepmc.org/abstract/MED/29487225
http://europepmc.org/abstract/MED/22922871